Fireproof dry-kiln door



' 1 647080 Oct' Z5 1927 D. n.- BUNDRICK nnsraonr xm xml noon F1ed Feb. 26. 1925 2 Sheets-Sheet 1 O 6/ z 5 r, ffl d -5! H M 7 l D. D. BUNDRICK FIREBUGF DRY KIL DOOR Filed Feb. 26A. 1925 2 Sheets-Sheet 2 2; i/lg 'i' Patented Oct. 25, 192;?.

UNITED STATES 1,647,080 PATENT OFFICE.

DAVID D. BUNDRICK, OF JACKSONVILLE, FLORIDA, ASSIGNOR TO MOORE DRY KILN COMPANY, OF JACKSONVILLE,l FLORIDA, A CORPORATION OF FLORIDA.

FIREPROOF DRY-KILN DOOR.

Application led February 26, 1925. Serial No. 11,839.

My invention relates to an improvement in fireproof dry kiln doors.

The object of my invention is to provide a door for use on dr kilns which is light, yet stronoF and dura le, and which is absolutely lireproof, it tting closely against the door frame to retain the heat within the kiln. Most of the dry kilns asV now built have the walls and roof of the kiln buildingy constructed of brick, hollow tile, concrete, or some similar lireproof construction, and then have the doors built of wood. My absolutely lreproof doors replacing the wooden doors would make the kiln entirely ireproof. As most dry kilns are now equipped With automatic sprinklers, a lire, should it occur inside the kiln, can be quickly extinguished, or at leastv confined to the one room, provided the doors are firepr'oot'v and are kept tightly closed. My improved freproof doors tit snugly and stay tight; even in case of fire. They help to confine the coniiagration to one room and prevent its spreading to adjoining rooms or buildinfrs. On the other hand, many dry kilns are destroyed by catching fire from outside buildings, and my fireproof doors are equally as eli'ective in protecting dry kilns from outside fires.

The door is constructed of an iron or steel frame upon which are secured sheets of as-4 bestos protected metal somewhat similar to that shown in the patent to Young, 1,432,512, October 17, 1922. This is a vast improvement over an all metal or all wooden or a combined metal or wooden door, for, in the first case, the strong acids used in the kiln will corrode or eat through the metal in a very short time thus making it necessary to replace the doors at frequent intervals. Also, the all metal door acts as a radiator to permitthe heat from the interior of the kiln to spread to the outside atmosphere, whereas the asbestos protected metal doors are insulators to hold the heat within the kiln where it is needed and this enables the user to get a much higher temperature within the kiln. The wooden doors are always subject to lires from both inside and outside of the kiln, and are also, and even more than the metal subject to being destroyed by the acids used within the kiln. The asbestos protection as applied to the metal door obviates the objections to both the sheet metal and wooden doors.

Another feature of my invention is the means for covering the overlapped meeting edges of the asbestos protected metal to prevent the acids from reaching the metal where the asbestos is cut, as, for instance, at. the bolt holes.

' In the accompanying drawings:

Fig. 1 is a rear view of my improved door;

Fig. is a detail vertical sectional view of the lower edge of the door on. the line 2 2. of Fig. 1;

Fig. 3 is a detail horizontal sectional view on the line 3 3 of Fig. 1;

Fig. 4 is a detail horizontal sectional view on line 1w-4 of F ig. 1 and showing the manner of countersinking the heads of the bolts in the convex iron bars;

gig. 5 is a front elevation of the door; an

Fig. 6 is a diagrammatic view of the asbestos protected metal.

The door is preferably constructed of an angle-iron frame l to which the sheets 2 of asbestos protected metal are secured by bolts 3. The sheets 2 of asbestos protected metal overlap at 4 and at each overlapped joint an angle iron brace 5 is secured, the bolts 3 passing through the overlapped edges and through the angle-iron braces 5. As shown in Figs. 1 and 5, the sheets 2 of asbestos protected metal extend vertically from the bottom to the top of the door, and there may be several sections to the door, depending upon the width thereof, but where the sectlons are overlapped or joined themetal bars 5 securely brace and strengthen the joined edges. Obviously, channel iron, or other forms of iron or steel bars may be used in the frame, instead of the angle-iron bars shown in the drawings.

As shown in Fig. 1, the asbestos protected metal is backed by a frame formed of con- Vex or half oval steel bars 6, which corresponds with the angle-iron frame in front of the asbestos protected metal. The convex bars 6 cover the overlapped portions 4 of the sheets 2, as shown in Fig. 4, and prevent the 100 acids within the kiln from reaching the metal where the asbestos is cut, as to form the holes therein for the bolts 3. The bolts 3 have the heads thereof countersunk at 7 within the convex bars 6. The convex bars 105 serve the further purpose of preventing the edges of the iron from rubbingr against the building, thereby preventlng iction.

The asbestos protected metal is made up,

as shown in Flg. 6, of a sheet of steel 8 110 upon which is placed a layer of asphalt 9, the latter having a layer of asbestos 10 around the same, and an outer asphalt protecting coating or envelope 11. Doors built of this asbestos protected metal are particularly adapted for dry kilns Where neither the Wooden nor the metal doors are satisfactory. Doors built entirely of Wood are bulky and heavy, they Warp badly and last but a short time. Any door built partially or entirely of Wood burns quickly in case of fire either inside oroutside the kiln. Doors built of sheet iron or steel have likewise proven unsatisfactory. The acid fumes from the lumber in the kiln attack the metal and Soon eat holes through the door. Doors constructed of sheet steel also act as a radiator and lose considerable heat, thereby increasing steam consumption. The asbestos protected metal door more than combines the insulating qualities of Wood with the strength and fire resisting qualities of steel, yet being light and economical as to cost. The rigid iron frame prevents warping or buckling of the door. These doors overcome the many short-comings of other types of doors and may be built to suit any ordinary type of door fixtures.

I claim: 4

1. A door including a frame, sheets of material secured thereto, the adjacent edges of said sheets being overlapped, angle-iron braces on one side of the overlapped portions, bars having convex outer surfaces on the opposite side of the overlapped portions, and means for securing the braces, bars, and overlapped portions together.

I2. A door including an angle-iron frame, sheets of material secured thereto and having overlapped adjacent edges, angle-iron braces on one side of the overlapped edges, bars having convex outer surfaces on the opposite side of the overlapped edges, and bolts having the heads thereof countersunk in the convex bars for securing the braces, bars, and overlapped edges together.

3. The combination with a door frame, of a door slidably suspended on a side thereof and including a frame, sheets of material secured thereto and having overlapped adjacent edges, and bars secured over the overlapped edges of the material and having convex outer surfaces in position to engage and slide over the door frame upon sliding movement of the door.

4. A door including a frame, sheets of material secured thereto and having the adjacent edges thereof overlapped, braces on one side of the overlapped portions, bars having convex outer surfaces on the opposite side ofthe overlapped portions, and means for securing the braces, bars and overlapped portions together.

In testimony whereof I aix my signature.

DAVID D. .BUN DRICK. 

